HTTP TRACE method.
The HTTP TRACE method is defined in section 9.6 of
RFC2616:
The TRACE method is used to invoke a remote, application-layer loop-
back of the request message. The final recipient of the request
SHOULD reflect the message received back to the client as the
entity-body of a 200 (OK) response. The final recipient is either the
origin server or the first proxy or gateway to receive a Max-Forwards
value of zero (0) in the request (see section 14.31). A TRACE request
MUST NOT include an entity.
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